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drv10983evm explain this circuit
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RE: DRV8703D-Q1: DRV8703 disturbance
Rajat,
The maximum PWM frequency is related to the external switch FET's Qg and charge pump current capability. The equation is on data sheet page 49. If the input signal INx is higher than that limit, you have to reduce it.
Yes. The PWM frequency is supplying to motor by turning on or off the external switching FETs.
The maximum PWM frequency is related to the external switch FET's Qg and charge pump current capability. The equation is on data sheet page 49. If the input signal INx is higher than that limit, you have to reduce it.
Yes. The PWM frequency is supplying to motor by turning on or off the external switching FETs.
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DRV8703D-Q1: DRV8703 disturbance
Part Number: DRV8703D-Q1
shall we change output frequency of DRV8703EVM, what is the range of output frequency, it is suppling to motor ?
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RE: DRV8308: behavior when switching position while moving
Hong，
According to your description, the EVM worked fine. But, you got a trouble on your board. Would you swap the DRV8308 IC between EVM and your board since the Rev b chip was one of the concerns.
Also, would you help list what do the changes or modifications between your board and the EVM?
I will consult other engineers to see if they have seen similar issue before on next Monday.
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I'm looking to drive a low voltage, low amperage motor, and I'm wondering if TI has any applicable nMOS transistors
Can I use 4 of these to drive a 4 phase bldc motor with signals 90 deg apart?
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RE: DRV10983: DRV10983_USB2ANY- Register writing error !!!
Sanmesh,
I have tried as per your suggestions.
Initially without USB2ANY connected, I was able to get desired voltages at the pins as (Vreg=5V , V3p3 = 3.3V , V1p8 = 1.8V)
But now as I am connecting the USB2ANY with laptop, I am unable to get any voltages at these pins (all are zero volts.)
And as I disconnect and reconnect the USB2ANY , the USB2ANY gives me following error messages:
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RE: DRV8809: DRV8809 random TSD
Hi,
It is very wired. Good PCB layout shuld have range of 20-30C/W. So we can handle 2.x W range normally. If you run all 4 motor drivers at the same time, it may heat up quickly by exceeding 2.x W. My suggestion is to reduce motor current or disable some of motors.
Unfortunaely i do not have ideas anymore. I believe this is not just one part issue which is broken.
It is very wired. Good PCB layout shuld have range of 20-30C/W. So we can handle 2.x W range normally. If you run all 4 motor drivers at the same time, it may heat up quickly by exceeding 2.x W. My suggestion is to reduce motor current or disable some of motors.
Unfortunaely i do not have ideas anymore. I believe this is not just one part issue which is broken.
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DRV8809: DRV8809 random TSD
Part Number: DRV8809
Hi,
I’m having an intermittent problem with the DRV8809 doing a thermal shutdown (TSD). I noticed it tends to happen when the motors (2 steppers) are moving, but I don’t think the chip is actually reaching the shutdown temperature.
I’ve confirmed a TSD is happening by looking at the LOG_OUT pin and playing with the TSD operation (bits 13-15 of the extended setup register).
I tried to monitor the temperature by configuring TH_OUT as an analog output (setting bit 12 on the extended setup register) and connecting an external pull up resistor to 3.3V. The voltage is always close to 3.3V, even when the motors are running, which I assume means that it is not heating up too much.
I then configured TH_OUT as a digital output (Pre-TSD) to see if I could at least see a warning before the chip actually shut off, but the Pre-TSD signal does not assert before the TSD signal, even though it should be coming 20° before the TSD.
The only way I’ve been able to “fix” the issue is by disabling the TSD (bit 7 of extended setup register), but I’m not sure if that’s dangerous.
Any ideas why it would randomly issue a TSD? And why the Pre-TSD does not trigger before the TSD??
Thank you!
PS: My problem sounds very similar to the one described in the following link but I could not see a solution. (http://e2e.ti.com/support/applications/motor_drivers/f/38/t/343406?DRV8809-shutting-down).
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DRV8353: 100% duty PWM
Part Number: DRV8353
Hi
The customer thinks the use of DRV8353S as gate driver for power FET.
Only on and off (100% duty) operation would be needed.
100% duty is supported by DRV8353S, so I think there is no concern about this usecase.
Is my understanding correct?
BestRegards
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RE: DRV8801: Reverse Current Reduction
Hi Wang,
Ch4 is OUT1 voltage and Ch3 is OUT2 voltage, The current is OUT1's Current, the peak high current was detected with every pwm whether it's slow decay mode or fast decay mode.
Drv8801 was used for the sweeping robot, we found that there was lots of Carbon which gather around the Carbon Brush after running for 1~2 month(normally, the motor can run as long as 3 months). the Carbon covered the rotor and caught a badly start, sometimes it even cound't start.
1) the reversed current was detected in the Brushed Motor, By changing the decay mode, the reversed current can be smaller but still there.
2) the peak current is very large and I'm afrain a greater current might cause a worse Carbon Brush wear out. is it true?
My questions are,
1) Why the Carbon Brush wear out so quickly? which reason can lead to such badly wear out? How to decrease the wear out of Carbon Brush and make the Brused motor work longer?
2) Is it possible to reduce the peak current especially reverse current? If so, how to do it? Is there a theoretical mathematical model which we can use to predict
and we notice the DRV8801's datasheet, the waveform of Out's Voltage and current was as follows which distinguish from our's, Why was it be different .
Our motor's inductance is 75uH and DCR is 13ohm. How to matching it with DRV8801 or other driver? Other parameter as following:
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RE: DRV8823: V3P3 power up delay at -5 degree C
James,
they have tested on four boards and our EVM board. All have the same problem.
they have tested on four boards and our EVM board. All have the same problem.
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DRV8823: V3P3 power up delay at -5 degree C
Part Number: DRV8823
Hi,
my customer is driving stepper motor with DRV8823.
They can drive the motor well at normal temperature, but need to wait for a while for the motor to run at -5C with the same control signal.
They found the problem is caused by delay power up of ABVREF, CDVREF, which are both from V3P3.
At 25C, ABVREF, CDVREF powered up at the same time with 24V at VM.
At -5C, ABVREF, CDVREF powered up 30 seconds later than 24V at VM. Which caused the stepper motor not rotating at beginning.
Schematic is as below:
Why V3P3 will delay such a long time at -5 degree C?
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RE: DRV2605: drive capacity
Hello Ivan-san,
Thank you for your investigation and comments.
Please keep working and let us know if there is any other concern.
Thanks and best regards,
Hiro
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DRV2605: drive capacity
Part Number: DRV2605
Hello,
Please let us know whether DRV2605 could drive below HAPTIC Reactor.
https://www.alps.com/prod/info/E/HTML/Haptic/
Our customer says they could not understand where they should read in the datasheet
to check that the DRV can drive or not a LRA/ERM that they'll use.
Thanks,
Hiro
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BOOST-DRV8711: DRV8711 stall check
Part Number: BOOST-DRV8711
Hi ALL:
now I am debugging the stall function of the DRV8711,I have configued the STALL Register with the value of
SDTHR = 0x70,SDCNT = 0x03,VDIV = 0x01;when the stepper motor just begin to run and the DRV8711 have checked the motor stall,so I have adjusted the STALL Register with the value of
SDTHR = 0x6F,SDCNT = 0x03,VDIV = 0x01;and then when the motor is in a stalled state but the DRV8711 don't detect the stall,
now I don't konow how to resolve the question!
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RE: DRV10983: DRV10983_USB2ANY- Register writing error !!!
I will look into it during office hours and get back to you.
I just want to confirm the following meanwhile:
1) When the usb2any is connected to the evm, and the evm is outputting 0V on all the pins, is Vcc still 24V on evm?
2) When you disconnect the usb2any from the evm, does it output the proper voltages on Vreg, V3p3, and V1p8 again?
3) If you have a second usb2any, please try testing with that, and see if the issue doesn't appear.
I haven't seen this issue before, but I will talk to my team and try to figure out what is going on.
I just want to confirm the following meanwhile:
1) When the usb2any is connected to the evm, and the evm is outputting 0V on all the pins, is Vcc still 24V on evm?
2) When you disconnect the usb2any from the evm, does it output the proper voltages on Vreg, V3p3, and V1p8 again?
3) If you have a second usb2any, please try testing with that, and see if the issue doesn't appear.
I haven't seen this issue before, but I will talk to my team and try to figure out what is going on.
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RE: DRV8303: Minimum required time for EN_GATE activation when reseting faults
Hello James,
Thanks. When do you think they will get back at you ?
Clément
Thanks. When do you think they will get back at you ?
Clément
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DRV8303: Minimum required time for EN_GATE activation when reseting faults
Part Number: DRV8303
Hi,
When manipulating the EN_GATE signal, we did find in the datasheet the maximum time we should not exceed in order to avoid putting the device in sleep mode.
However, we didn't see any minimum time requirement for this signal to be taken into account when deactivating/activating it to reset internal faults.
Could you please tell us what is the minimum duration required from the pulse to reset internal faults ?
Best Regards,
Clément
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BOOSTXL-DRV8305EVM: BOOSTXL-DRV8305EVM using with LAUNCHXL-F28027F
Part Number: BOOSTXL-DRV8305EVM
Hello
I have TI PN: BOOSTXL-DRV8305EVM with LAUNCHXL-F28027F.
I am using the above to drive a 3-phase BLDC sensorless motor (24V, 6.8A max) that runs a pump. Using the project solutions I have gotten the motor to run however the pump that the motor runs isn't turning on. The current draw is less than the nominal. I also notice that the referenced motor RPM is never reached. Which project lab can I fully operate the motor? Please advise.
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RE: DRV8305: not getting pwm output
Hi Rashi,
Can you provide some information about your system setup?
- What is your PVDD voltage?
- Are you setting the EN_GATE pin high before attempting to apply the PWM input?
- Is nFAULT low?
- Are there any fault flags in registers 0x1, 0x2, 0x3, or 0x4?
- Are you trying to use 1x, 3x, or 6xPWM mode?
Thanks,
Garrett
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